Thermal Decomposition of Ammonium Salts of Transition Metal Oxyacids. I. Thermogravimetric Analysis of Ammonium Paramolybdate

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概要

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• The decomposition of ammonium paramolybdate (APM) has been investigated by using a quartz spring balance in various ambient pressures. APM is decomposed in four or five stages, including a dehydration procedure, depending on the ambient pressures. However, these results do not agree with those of previous reports. This discrepancy may be attributed to the use of a sensitive quartz spring balance, a small amount of a sample, the application of a slow heating rate, or the utilization of DTG curves in the present study. The control of the ambient pressure was effective in investigating the thermogravimetric change in detail, especially in confirming the dehydration reaction. It is also concluded clearly that, in the course of the decomposition process, there is a final decomposition stage which has never been reported. The kinetics of the thermal decomposition was studied. The activation energies of the decomposition of APM under 760 Torr are 38.6, 194.8, 81.9, and 151.2 kcal·mol<SUP>－1</SUP> respectively for the first to the fourth stages.

著者

• Park Il-hyun

  Department Of Biochemistry Chungnam National University

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• Thermal Decomposition of Ammonium Salts of Transition Metal Oxyacids. I. Thermogravimetric Analysis of Ammonium Paramolybdate
• Thermal Decomposition of Ammonium Salts of Transition Metal Oxyacids. II. The Determination of the Gas Constituents Evolved by Ammonium Paramolybdate Decomposition

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